Added faqs translated links

Closes #675

app/js/controllers.js

@@ -359,6 +359,18 @@ angular.module('myApp.controllers', ['myApp.i18n'])
       });
     };
 
+    $scope.openFaq = function () {
+      var url = 'https://telegram.org/faq';
+      switch (Config.I18n.locale) {
+        case 'es-es': url += '/es'; break;
+        case 'it-it': url += '/it'; break;
+        case 'de-de': url += '/de'; break;
+        case 'ko-ko': url += '/ko'; break;
+        case 'pt-br': url += '/br'; break;
+      };
+      window.open(url, '_blank');
+    };
+
     $scope.openContacts = function () {
       ContactsSelectService.selectContact().then(function (userID) {
         $scope.dialogSelect(AppUsersManager.getUserString(userID));

app/partials/desktop/head.html

@@ -21,7 +21,7 @@
           <li><a ng-click="openSettings()">
             <i class="icon icon-settings"></i><span my-i18n="im_settings"></span>
           </a></li>
-          <li><a href="https://telegram.org/faq" target="_blank">
+          <li><a ng-click="openFaq()">
             <i class="icon icon-faq"></i><span my-i18n="head_telegram_faq"></span>
           </a></li>
           <li><a href="" ng-click="openChangelog()">

app/partials/mobile/chat_modal.html

@@ -18,7 +18,7 @@
               <a ng-click="editTitle()" my-i18n="group_modal_menu_edit_group"></a>
             </li>
             <li ng-if="chatFull.chat._ != 'chatForbidden' &amp;&amp; !chatFull.chat.left">
-              <a ng-click="leaveGroup()" my-i18n="group_modal_menu_leave_group"></a>
+              <a ng-click="leaveGroup()" my-i18n="group_modal_menu_leave"></a>
             </li>
             <li>
               <a ng-click="flushHistory()" my-i18n="group_modal_menu_delete_chat"></a>